/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.cxf.jaxrs.rx.provider;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Providers;

import org.apache.cxf.jaxrs.utils.InjectionUtils;

import rx.Observable;

public class ObservableReader<T> implements MessageBodyReader<Observable<T>> {
    
    @Context
    private Providers providers;
    
    @Override
    public boolean isReadable(Class<?> arg0, Type arg1, Annotation[] arg2, MediaType arg3) {
        return true;
    }

    @Override
    public Observable<T> readFrom(Class<Observable<T>> cls, Type t, Annotation[] anns, MediaType mt,
                                  MultivaluedMap<String, String> headers, InputStream is)
                                      throws IOException, WebApplicationException {
        @SuppressWarnings("unchecked")
        Class<T> actualCls = (Class<T>)InjectionUtils.getActualType(t);
        final MessageBodyReader<T> mbr = 
            (MessageBodyReader<T>)providers.getMessageBodyReader(actualCls, actualCls, anns, mt);
        if (mbr == null) {
            throw new ProcessingException("MBR is null");
        }
        return Observable.just(mbr.readFrom(actualCls, actualCls, anns, mt, headers, is));
    }
}
